josh. >> thank you, jim. we'll turn now to the latest on the investigation unfolding. authorities working this morning to connect so many dots. one big clue could be monday's date, april 15th, the anniversary of some of the most harrowing incidents in domestic coming this week and abc's pierre thomas in washington has been tracking all the latest and has that right now for us. good morning, pierre. >> reporter: good morning, josh. my sources tell me it's the evidence on scene and witnesses that will break open the case. the list of potential suspects could be long because investigators know this stretch of april is one with a dark history. this friday, april 19th is also the anniversary of two of the most traumatic days in the country's recent history. in 1993 a 51-day standoff between federal law enforcement and branch davidian leader david koresh ended with 80 dead including 25 children when koresh refused to surrender peacefully. on the same day two years later, timothy mcveigh bombed the alfred murrah federal building in oklahoma city killing 168 including 19 child